Design the generalization for the reduction of higher order data to 1D/2D display data

[cmeyer]

Display ideas - user can have multiple displays; each display may have it's own sequence/collection/mask/etc.

One way to think about things: the slice interval is a function to reduce the data to 1d; the mask/integration is another function to reduce to 1d. Maybe the display data channel should track the "function to reduce to 1d" for collections; then the "graphics" should be used to edit that.